sounds like hes only doing it because he knows it bothers you so the only way to get him to stop is to stop caring or at least pretend not to care like if he goes if you dont answer me i will yell nigger right now just shrug and say whatever go ahead he may or may not call your bluff and do it anyways you should expect him to do it so that if he does you dont look surprised if you seem surprised hell know you lied and actually do care